38
Unit:mm
●
Refrigerant pipe diameter is different according to indoor unit to be connected. When using extension pipes,refer to the
tables below.
●
When diameter of refrigerant pipe is different from that of outdoor unit union, use optional Different-diameter pipe.
For further information on Different-diameter pipe,see 16-1.
Outdoor unit union diameter
For
Liquid
6.35(1/4)
Indoor unit A
Gas
12.7(1/2)
Liquid
6.35(1/4)
Indoor unit B
Gas
9.52(3/8)
Liquid
6.35(1/4)
Indoor unit C
Gas
9.52(3/8)
Liquid
6.35(1/4)
Indoor unit D
Gas
9.52(3/8)
Unit : mm (inch)
Piping length each indoor unit (a, b, c, d)
25m
Total piping length (a+b+c+d)
70m
Height difference between units (H)
10m
Bending point for each unit
25
Total bending point
70
❋
It does not matter which unit is higher.
a
b
c
d
Outdoor
unit
Indoor
units
H
H
H
Refrigerant piping length (one way, 4 unit total)
Calculation : Xg=20g/mx(Refrigerant piping length(m)-40)
Outdoor unit
precharged
60m
400
40m
0
50m
200
3,500
70m
600
MXZ-4A80VA
Indoor unit
D
Ball valve with
service port
Ball valve
Distributor
Power
receiver
LEV A
LEV B
LEV C
LEV D
Oil separator
Compressor
High-pressure
switch
Distributor
Muffler
4-way valve
LEV E
Outdoor
heat
exchanger
Unit D gas pipe
temperature thermistor
[
9.52
Indoor unit
C
Unit C gas pipe
temperature thermistor
[
9.52
[
6.35
[
6.35
[
6.35
[
6.35
Indoor unit
B
Unit B gas pipe
temperature thermistor
[
9.52
Indoor unit
A
Indoor unit
A
Indoor unit
B
Indoor unit
C
Indoor unit
D
Unit A gas pipe
temperature thermistor
[
12.7
[
16
[
16
[
16
[
16
[
16
Capillary tube
[
4.0
✕
[
2.4
✕
400
Capillary tube
[
2.5
✕
[
0.6
✕
1000
[
9.52
Capillary tube
[
4.0
✕
[
2.8
✕
90
Discharge
temperature
thermistor RT62
Strainer
#100
Strainer
#100
Strainer
#100
Strainer
#100
R.V. coil
OFF
ON
Refrigerant flow in cooling
Refrigerant flow in heating
Defrost
thermistor
RT61
Outdoor heat
exchanger
temperature
thermistor
RT68
Ambient
temperature
thermistor
RT65
Strainer
#100
Strainer
#100
MAX REFRIGERANT PIPING LENGTH
Indoor unit
Extension pipe diameter
class
Pipe diameter
Liquid
6.35(1/4)
Liquid
6.35(1/4)
22/25/35
Gas
9.52(3/8)
Gas
9.52(3/8)
Liquid
6.35(1/4)
Liquid
6.35(1/4)
50
Gas
12.7(1/2)
Gas
12.7(1/2)
Liquid
6.35(1/4)
Liquid
6.35(1/4)
60
Gas
15.88(5/8)
Gas
15.88(5/8)
Liquid
9.52(3/8)
Liquid
9.52(3/8)
71
Gas
15.88(5/8)
Gas
15.88(5/8)
OB377--2.qxp 05.12.14 3:13 PM Page 38
